/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineSessionInterface.h
Registers a local player with a session.
void RegisterLocalPlayer ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & PlayerId, [FName](API\Runtime\Core\UObject\FName) SessionName, const [FOnRegisterLocalPlayerCompleteDelegate](API\Plugins\OnlineSubsystem\Interfaces\FOnRegisterLocalPlayerCompleteDe-) & Delegate )